A) p-cresol
B) o-cresol
C) p-nitrophenol
D) p-chlorophenol
Correct Answer: C
Solution :
Presence of electron with drawing substitutent (like\[N{{O}_{2}},Cl\])stabilises the phenoxide ion more by dispersal of negative charge, thus increases the acidity of phenol. While election releasing groups (like\[C{{H}_{3}},OC{{H}_{3}}\]etc) destabilises the phenoxide ion by intensifying the negative charge and thus, decreases the acidity of phenol. Electron withdrawing power of nitro group is more than the chloro group. Hence, p-nitro phenol is most acidic among the given.
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